Tracy R Reed wrote:
Ok, so over the course of the last few days I think I have got just
about everything figured out. I have a full backup of all three of my
systems safely on DVD, I can restore, it does incrementals automatically
every night, I am happy.
Except for one thing: The backups are VERY slow. Even the host local to
the DVD burner is very slow so it cannot be the network even though I
have tested that and it is very fast. It seems to run somewhere between
100k/s and 1M/s. I do not know why it varies. It seems like perhaps it
gets faster as the backup progresses, I'm not sure. At first I thought
maybe I was somehow running out of disk bandwidth or causing disk
contention since I am backing up from and spooling DVD images to the
same spindle. But I ran some disk benchmarks and watched iostat and
while the backup is running I can get 50MB/s disk throughput. Plus it's
slow when streaming from other hosts and spooling locally. Also, the cpu
time is 95% idle during the backup so it isn't cpu contention. So it
would seem that the delay must be coming from somewhere within bacula
itself. A full backup of my system should take just a couple of hours,
not 12!
I am running bacula from CVS as of three or four days ago on an AMD64
running FC4.
Any ideas? Thanks!
Tracy --
I noticed in the release notes for 1.38.0 the following:
- Note, with gcc (GCC) 4.0.1 20050727 (Red Hat 4.0.1-5) on an
AMD64 CPU running 64 bit CentOS4, there is a compiler bug that
generates bad code that causes Bacula to segment fault.
Typically you will see this in the Storage daemon first. The
solution is to compile Bacula ensuring that no optimization is
turned on (normally it is -O2).
I realize you aren't complaining about segfaults but as a test you might
turn off optimization and recompile to see if that makes any difference.
Regards,
Karl Cunningham
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